22173381208021 has 2 divisors, whose sum is σ = 22173381208022. Its totient is φ = 22173381208020.

The previous prime is 22173381207997. The next prime is 22173381208031. The reversal of 22173381208021 is 12080218337122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18373653602500 + 3799727605521 = 4286450^2 + 1949289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22173381208021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22173381208031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11086690604010 + 11086690604011.

It is an arithmetic number, because the mean of its divisors is an integer number (11086690604011).

Almost surely, 2^{22173381208021} is an apocalyptic number.

It is an amenable number.

22173381208021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22173381208021 is an equidigital number, since it uses as much as digits as its factorization.

22173381208021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 22173381208021 in words is "twenty-two trillion, one hundred seventy-three billion, three hundred eighty-one million, two hundred eight thousand, twenty-one".